I have been looking hard at the air box. I do not think we will see any improvements in terms of HP without adding a larger fresh air supply. Think about it how much work do you want to do adding a new air box. This is how most manufactures think also. Designing for easy install not maximum gain. Example in order for me to add fresh ram air I needed to remove the windshield washer tank and fab up a new one. Now I have a 6" DIA tube ready to tap into the air box. I have cut open the bottom front side of the air box to let some air in but it’s not complete.